数据存储与处理分离架构下的子链接消除及优化

Sublink elimination and optimization in data storage and processing separation architecture

在数据存储与处理分离架构下的NewSQL数据库中实现了子链接消除的功能,使其支持大部分子链接的执行,减少了从集中式数据库向分布式数据库迁移所需要的SQL改造代价,使得NewSQL数据库可以在电信、银行等传统行业投入使用.同时针对数据存储与处理分离的架构,对子链接消除之后的执行进行了优化,尽量减少了不同服务器之间数据的传输量.实现的结果使得NewSQL成功支持了大部分的子链接,且子链接执行效率也得到了提升.

This paper implemented a sublink elimination optimizer in NewSQL RDBMS（Relational Database Management System）.The purpose of the optimizer is to make complex SQL so that it can be executable in New SQL systems,and achieve auto-tuning of complex SQL to reduce the cost of migrating from a centralized database to a distributed database; this would make the NewSQL DBMS（Database Management System） available to telecomunications and banking industries.We also provide a method to minimize data transmission between servers after sublink promotion.Experiments show that the optimization effect of the query optimizer is notable and can replace manual optimization and reduce the workload of application migration.